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Alnico Ring Magnets

/Alnico Ring Magnets
  • Alnico Ring Magnets

Alnico Ring Magnets, Ring Alnico Permanent Magnets, Sintered Alnico Ring Magnet, Alnico alloy magnet, Cast AlNICo Magnet China Factory Supplier

Alnico Ring Magnets – What is the Alnico Magnet?
Alnico magnet is an acronym referring to a family of iron alloys which in addition to iron are composed primarily of aluminium (Al), nickel (Ni) and cobalt (Co), hence al-ni-co. They also include copper, and sometimes titanium. Alnico alloys are ferromagnetic, with a high coercivity (resistance to loss of magnetism) and are used to make permanent magnets. Before the development of rare earth magnets in the 1970s, they were the strongest type of magnet. Other trade names for alloys in this family are: Alni, Alcomax, Hycomax, Columax, and Ticonal.

The composition of alnico alloys is typically 8–12% Al, 15–26% Ni, 5–24% Co, up to 6% Cu, up to 1% Ti, and the balance is Fe. The development of alnico began in 1931, when T. Mishima in Japan discovered that an alloy of iron, nickel, and aluminum had a coercivity of 400 oersted (Oe) (32 kA/m), double that of the best magnet steels of the time.

Alnico alloys make strong permanent magnets, and can be magnetized to produce strong magnetic fields. Of the more commonly available magnets, only rare-earth magnets such as neodymium and samarium-cobalt are stronger. Alnico magnets produce magnetic field strength at their poles as high as 1500 gauss (0.15 tesla), or about 3000 times the strength of Earth’s magnetic field. Some brands of alnico are isotropic and can be efficiently magnetized in any direction. Other types, such as alnico 5 and alnico 8, are anisotropic, with each having a preferred direction of magnetization, or orientation. Anisotropic alloys generally have greater magnetic capacity in a preferred orientation than isotropic types. Alnico’s remanence (Br) may exceed 12,000 G (1.2 T)[clarification needed], its coercivity (Hc) can be up to 1000 oersted (80 kA/m), its energy product ((BH)max) can be up to 5.5 MG·Oe (44 T·A/m). This means alnico can produce a strong magnetic flux in closed magnetic circuit, but has relatively small resistance against demagnetization.

Alnico Magnet Application:
1. ABS braking system magnets
2. ABS braking system magnets
3. Reed switch operating magnets
4. Electricity meter damping magnets
5. Holding/clamping applications
6. Microwave applications
7. Weighing scale damping magnets
8. Electropermanent systems
9. Calibration magnets
10. Heat treatment jigs and fixtures

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Product Range

Grade Br
(Bd Hd) max
Curie Temp.
Temp. Coe
Max. Practical Operating
Temp. [˚F]
Alnico 1 7200 480 1.40 1490 0.016 842
Alnico 2 7000 620 1.60 1490 0.016 842
Alnico 3 6500 530 1.20 1490 0.016 842
Alnico 5 12200 650 5.50 1580 0.011 977
Alnico 6 10500 700 3.50 1580 0.011 977
Alnico 8 8800 1500 5.50 1580 0.014 1022
Alnico 9 10500 1410 9.00 1580 0.014 1022
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